US4670661A - Battery backup circuit - Google Patents

Battery backup circuit Download PDF

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Publication number
US4670661A
US4670661A US06/754,218 US75421885A US4670661A US 4670661 A US4670661 A US 4670661A US 75421885 A US75421885 A US 75421885A US 4670661 A US4670661 A US 4670661A
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United States
Prior art keywords
backup
main
battery
board
boards
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Expired - Lifetime
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US06/754,218
Inventor
Mamoru Ishikawa
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Tokyo Electron Ltd
Toshiba TEC Corp
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Tokyo Electric Co Ltd
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Assigned to TOKYO ELECTRIC CO., LTD., 6-13, 2-CHOME, NAKAMEGURO, MEGURO, TOKYO, JAPAN reassignment TOKYO ELECTRIC CO., LTD., 6-13, 2-CHOME, NAKAMEGURO, MEGURO, TOKYO, JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ISHIKAWA, MAMORU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

Definitions

  • the present invention relates to a battery backup circuit for supplying backup power when power from a main electric power source is cut off.
  • FIGS. 4 and 5 An example of such circuits is shown in FIGS. 4 and 5.
  • input terminals T a , T b , T c are each connected with a main power source, in which the input terminal T a is connected to an output terminal T d through a switch 1 which is turned ON/OFF in response to the voltage of the main power source.
  • a backup battery 2 and a diode a 3 in series, and between a junction point of the backup battery 2 and the diode a 3 and the input terminal T b are connected a resistor R and a diode b 4 in series. And the input T c is grounded.
  • the main power source when the main power source is ON, the electric power from the main power source is supplied to the output terminal T d , and at the same time, the backup battery 2 is charged with electricity. And, when the main power source is OFF, the output terminal T d is supplied with electric power from the backup battery 2.
  • the diode a 3 and diode b 4 are for preventing runarounds of electric power.
  • the battery backup circuit is disposed on a PC board, for example, and in such a case, the backup power is often needed by a plurality of PC boards.
  • FIG. 5 shows an example where backup power is adapted to be supplied to a plurality of PC boards. That is, there are provided n pieces of PC boards, PC board 1 5, PC board 2 6, and PC board n 7, and a backup circuit 8 is provided only on the PC board 1 5, wherein the backup circuit 8 is adapted to supply backup power to each PC board when necessary.
  • a primary objective of the invention is the provision of backup power for each PC board without using a lot of large capacity batteries.
  • Another objective of the invention is the provision of a battery backup circuit capable of supplying each PC board with power from a small capacity battery.
  • a further objective of the invention is to make the consuming rate of electric power by each PC board even.
  • a still further objective of the invention is the provision of a battery backup circuit which can be manufactured at lower cost.
  • FIG. 1 is a circuit diagram showing a first preferred embodiment of the invention
  • FIG. 2 is a circuit diagram showing a second preferred embodiment of the invention.
  • FIG. 3 is a circuit diagram showing a third preferred embodiment of the invention.
  • FIG. 4 is a circuit diagram showing an example of conventional battery backup circuit
  • FIG. 5 is a schematic block diagram showing a state of supplying backup power to each PC board.
  • a battery backup circuit is made up of a main block 10 and subblocks 12 one each thereof being provided on each of n pieces of PC boards 11.
  • the main block 10 there are provided input terminals T 1 , T 2 , T 3 , and T connected with a main power source, in which the input terminal T 2 is connected in series with a resistor R 1 and a diode 1 13, to which diode 1 13 is connected a main backup battery 14.
  • the input terminal T 4 is grounded.
  • the subblock 12 there is provided an output terminal T 5 connected in series with the input terminal T 1 through a switch 15, which cooperates with turning ON/OFF of the main power source.
  • a diode 2 16 which is connected in series with the main backup battery 14, and a diode 3 18, which is connected in series with a backup battery 17 having smaller capacity than the main backup battery 14.
  • a resistor R 2 and a diode 4 19 which are connected in series with the input terminal T 3 .
  • the PC board 11 is provided with, in addition to the subblock 12, a circuit portion 20 which needs the supply of electric power, an input terminal T 6 of the circuit portion 20 being connected with the output terminal T 5 .
  • each subblock 12 receives the supply of electric power from whichever having higher voltage of the main backup battery 14 and the backup battery 17. If, then, a specific board 11 is removed, the subblock 12 on the removed PC board 11 is cut off from the supply of electric power from the main backup battery 14 and receives the supply of backup power only from the backup battery 17 present in the subblock 12. Meanwhile, the diode 2 16 and the diode 3 18 serve for preventing runarounds of electric power.
  • the backup power is eventually supplied to each PC board 11 from the main backup battery 14 having larger capacity, and therefore, even if the PC boards are not equal in their amounts of power consumption, no one will be faster or slower in the power exhausting rates.
  • the backup battery 17 is required to supply the backup power only to the removed PC board 11, it can be of a small capacity.
  • the backup circuit is provided with the backup battery 17 disposed on each PC board 11, it requires a battery of a higher capacity only for the main backup battery 14. Consequently, the backup circuit can be provided at lower cost.
  • the switch 15 is provided within the main block 10
  • a diode 5 21 is provided within each subblock 12 connected in series between the switch 15 and a junction point of the main backup battery 14 and the backup battery 17, and the input terminal T3 is combined with the input terminal T 2 .
  • the function of the diode 5 21 is to prevent a runaround of electric power from the backup battery 17 on the PC board 11 to which the diode 5 21 belongs to other PC boards 11.
  • the diode 2 16 and the switch 15 are provided within the main block 10
  • the diode 21 is provided within each subblock 12 connected in series between the switch 15 and the backup battery 17
  • the input terminal T 3 is combined with the input terminal T 2
  • the diode 2 16 provided within the main block 10 is connected to a point between the switch 15 and the diode 5 21.
  • unrechargeable batteries or primary batteries
  • unrechargeable batteries or primary batteries
  • the present invention is arranged, in a battery backup circuit wherein n pieces of PC boards are to be supplied with backup power from a main backup battery, such that a backup battery of lower capacity than the main backup battery is provided on each PC board connected to the main backup battery with runaround preventing diodes interposed therebetween. Therefore, it is enabled to supply electric power independently for each PC board and it has been made possible to remove any PC board at will. Since the power consumption rates are made equal for all the PC boards, the backup circuit can be operated in a stable state. Further, since a larger capacity of battery is required only for the main backup battery, the backup circuit can be constructed less costly.

Abstract

A battery backup circuit including n pieces of PC boards which are to be supplied with electric power from a main power source, switches to be turned on or off in response to the voltage of the main power source, a main backup battery for supplying each PC board with backup power when the main power source is cut off by the switch, and a backup battery having smaller capacity than the main backup battery provided on each of the PC boards and put in connection with the main backup battery with runaround preventing diodes interposed therebetween, so that each PC board may be independently supplied with backup power and provided with the even rate of electric power consumption, and that the battery backup circuit may be manufactured at low cost.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a battery backup circuit for supplying backup power when power from a main electric power source is cut off.
2. Description of the Prior Art
There have been used some battery backup circuits which are adapted to provide backup power, when the supply of power from a main power source is cut off, to a circuit or the like which needs the supply of electric power. An example of such circuits is shown in FIGS. 4 and 5. Referring to the drawings, input terminals Ta, Tb, Tc are each connected with a main power source, in which the input terminal Ta is connected to an output terminal Td through a switch 1 which is turned ON/OFF in response to the voltage of the main power source. To a junction point of the switch 1 and the output terminal Td are connected a backup battery 2 and a diodea 3 in series, and between a junction point of the backup battery 2 and the diodea 3 and the input terminal Tb are connected a resistor R and a diode b 4 in series. And the input Tc is grounded. In the described circuit, when the main power source is ON, the electric power from the main power source is supplied to the output terminal Td, and at the same time, the backup battery 2 is charged with electricity. And, when the main power source is OFF, the output terminal Td is supplied with electric power from the backup battery 2. The diodea 3 and diode b 4 are for preventing runarounds of electric power.
The battery backup circuit is disposed on a PC board, for example, and in such a case, the backup power is often needed by a plurality of PC boards. FIG. 5 shows an example where backup power is adapted to be supplied to a plurality of PC boards. That is, there are provided n pieces of PC boards, PC board 1 5, PC board2 6, and PC board n 7, and a backup circuit 8 is provided only on the PC board 1 5, wherein the backup circuit 8 is adapted to supply backup power to each PC board when necessary. In this arrangement, there are such disadvantages that, if the PC board 1 5 is removed, then the PC board2 6 and PC board n 7 will not be supplied with the backup power, and if the PC board2 6 or the PC board n 7 is removed, then the removed PC board will not be supplied with the backup power. If, then, the n pieces of the PC boards each are independently provided with a backup circuit 8, the freedom of removing any PC board may be provided, but the circuit will become costly. Such arrangement has a further demerit that the stability of the circuit will be lost since the amounts of electric power to be consumed by the PC boards from respective backup batteries 2 are not even.
SUMMARY OF THE INVENTION
A primary objective of the invention is the provision of backup power for each PC board without using a lot of large capacity batteries.
Another objective of the invention is the provision of a battery backup circuit capable of supplying each PC board with power from a small capacity battery.
A further objective of the invention is to make the consuming rate of electric power by each PC board even.
A still further objective of the invention is the provision of a battery backup circuit which can be manufactured at lower cost.
Other objectives of the invention will become apparent from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram showing a first preferred embodiment of the invention;
FIG. 2 is a circuit diagram showing a second preferred embodiment of the invention;
FIG. 3 is a circuit diagram showing a third preferred embodiment of the invention;
FIG. 4 is a circuit diagram showing an example of conventional battery backup circuit; and
FIG. 5 is a schematic block diagram showing a state of supplying backup power to each PC board.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A first preferred embodiment of the invention will be described referring to FIG. 1. A battery backup circuit is made up of a main block 10 and subblocks 12 one each thereof being provided on each of n pieces of PC boards 11. In the main block 10, there are provided input terminals T1, T2, T3, and T connected with a main power source, in which the input terminal T2 is connected in series with a resistor R1 and a diode 1 13, to which diode 1 13 is connected a main backup battery 14. The input terminal T4 is grounded. In the subblock 12, there is provided an output terminal T5 connected in series with the input terminal T1 through a switch 15, which cooperates with turning ON/OFF of the main power source. To a junction point of the output terminal T5 and the switch 15 are connected in parallel a diode 2 16, which is connected in series with the main backup battery 14, and a diode 3 18, which is connected in series with a backup battery 17 having smaller capacity than the main backup battery 14. To a junction point of the diode 3 18 and the backup battery 17 are connected a resistor R2 and a diode 4 19 which are connected in series with the input terminal T3.
The PC board 11 is provided with, in addition to the subblock 12, a circuit portion 20 which needs the supply of electric power, an input terminal T6 of the circuit portion 20 being connected with the output terminal T5.
In the described arrangement, when the main power source is ON, electric power is supplied from the output terminal T5 to the circuit portion 20 through the input terminal T6. And at the same time, both the main backup battery 14 and the backup battery 17 are charged by electric power from the main power source. Meanwhile, the diode 1 13 and the diode 4 19 prevent runarounds of electric power.
When the main power source is turned OFF, the switch 15 in cooperation therewith is turned OFF, and at this time, each subblock 12 receives the supply of electric power from whichever having higher voltage of the main backup battery 14 and the backup battery 17. If, then, a specific board 11 is removed, the subblock 12 on the removed PC board 11 is cut off from the supply of electric power from the main backup battery 14 and receives the supply of backup power only from the backup battery 17 present in the subblock 12. Meanwhile, the diode 2 16 and the diode 3 18 serve for preventing runarounds of electric power.
As described above, when the main power supply has been turned OFF, the backup power is eventually supplied to each PC board 11 from the main backup battery 14 having larger capacity, and therefore, even if the PC boards are not equal in their amounts of power consumption, no one will be faster or slower in the power exhausting rates. And, since the backup battery 17 is required to supply the backup power only to the removed PC board 11, it can be of a small capacity. Thus, although the backup circuit is provided with the backup battery 17 disposed on each PC board 11, it requires a battery of a higher capacity only for the main backup battery 14. Consequently, the backup circuit can be provided at lower cost.
A second preferred embodiment of the invention will be described below with reference to FIG. 2, wherein like parts to those in the first preferred embodiment are indicated by corresponding reference characters and description thereof may be omitted (this will be applicable to all the drawings that follow). In the present embodiment, the switch 15 is provided within the main block 10, a diode 5 21 is provided within each subblock 12 connected in series between the switch 15 and a junction point of the main backup battery 14 and the backup battery 17, and the input terminal T3 is combined with the input terminal T2. By the described arrangement, it becomes possible to save the number of the switches 15 and simplify the structure of the overall circuit. The function of the diode 5 21 is to prevent a runaround of electric power from the backup battery 17 on the PC board 11 to which the diode 5 21 belongs to other PC boards 11.
Now, a third preferred embodiment of the invention will be described with reference to FIG. 3. In the present embodiment, the diode 2 16 and the switch 15 are provided within the main block 10, the diode 21 is provided within each subblock 12 connected in series between the switch 15 and the backup battery 17, the input terminal T3 is combined with the input terminal T2, and the diode 2 16 provided within the main block 10 is connected to a point between the switch 15 and the diode 5 21. By the described arrangement, the numbers of the switches 15 and the diodes 2 16 can be saved and the structure of the overall circuit simplified.
By the way, unrechargeable batteries, or primary batteries, may also be used in carrying out the invention.
As described so far, the present invention is arranged, in a battery backup circuit wherein n pieces of PC boards are to be supplied with backup power from a main backup battery, such that a backup battery of lower capacity than the main backup battery is provided on each PC board connected to the main backup battery with runaround preventing diodes interposed therebetween. Therefore, it is enabled to supply electric power independently for each PC board and it has been made possible to remove any PC board at will. Since the power consumption rates are made equal for all the PC boards, the backup circuit can be operated in a stable state. Further, since a larger capacity of battery is required only for the main backup battery, the backup circuit can be constructed less costly.

Claims (6)

What is claimed is:
1. A battery backup circuit comprising a main block and n pieces of PC boards to be supplied with electric power from a main power source, a switch means to be turned on or off in response to the voltage of the main power source, a main backup battery on said main block for supplying each PC board with backup power when the main power source is cut off by said switch means, and a backup battery having a smaller capacity than said main backup battery provided on each of the PC boards being put in connection with said main backup battery with at least one runaround preventing diode interposed between said main backup battery and each of said backup batteries.
2. A battery backup circuit according to claim 1, wherein said switch means is a single switch provided on the main block and a runaround preventing diode is provided on each of the PC boards.
3. A battery backup circuit according to claim 2, wherein only one main runaround preventing diode for said main backup battery is provided on the main block and the same is connected between said main backup battery and said runaround preventing diode provided on each of the PC boards.
4. A battery backup circuit according to claim 1, wherein said switch provided on each PC board.
5. A battery backup circuit according to claim 4, wherein a runaround preventing diode is provided on each of the PC boards.
6. A battery backup circuit according to claim 2, wherein the runaround preventing diode provided on each of the PC boards is connected between said switch and a junction point of said main backup battery and said backup battery.
US06/754,218 1984-08-01 1985-07-12 Battery backup circuit Expired - Lifetime US4670661A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59-162692 1984-08-01
JP16269284A JPS6142235A (en) 1984-08-01 1984-08-01 Battery backup circuit

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GB (1) GB2162706B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4760276A (en) * 1987-11-09 1988-07-26 Unisys Corporation Power supply system, for segmented loads, having phantom redundancy
US4795914A (en) * 1986-12-26 1989-01-03 Kabushiki Kaisha Toshiba Power supply circuit with backup function
DE3926351A1 (en) * 1988-08-31 1990-03-29 Siemens Ag Power supply installation suitable for important electronic system - has emergency constant voltage source(s) connected via diode(s) and having current limiter(s)
EP0467778A2 (en) * 1990-07-16 1992-01-22 Fujitsu Limited A power supply device
US5138142A (en) * 1990-06-19 1992-08-11 Mitsubishi Denki Kabushiki Kaisha Ic card with improved power supply switching circuitry
US5160851A (en) * 1990-08-28 1992-11-03 Nynex Corporation Rechargeable back-up battery system including a number of battery cells having float voltage exceeding maximum load voltage
US5300874A (en) * 1989-09-29 1994-04-05 Kabushiki Kaisha Toshiba Intelligent power supply system for a portable computer
US5777454A (en) * 1996-05-29 1998-07-07 Peco Ii, Inc. Back-up battery management system for a DC power supply
US5886503A (en) * 1996-05-29 1999-03-23 Peco Ii, Inc. Back-up battery management apparatus for charging and testing individual battery cells in a string of battery cells
US5892299A (en) * 1996-09-24 1999-04-06 Siewert; James Carl Simultaneous power supply source
US6104103A (en) * 1998-05-08 2000-08-15 Ingalls Shipbuilding, Inc. Simultaneous power supply source
US20050074375A1 (en) * 2003-09-26 2005-04-07 Das - Dunnschicht Anlagen Systeme Gmbh Modular system for the treatment of process exhaust gases containing pollutants
CN1330074C (en) * 2003-04-23 2007-08-01 华为技术有限公司 Method and device for backing up secondary power source
US8023290B2 (en) 1997-01-24 2011-09-20 Synqor, Inc. High efficiency power converter
US20110308833A1 (en) * 2011-08-30 2011-12-22 Renewable Power Conversion, Inc. Photovoltaic string sub-combiner
US20150248150A1 (en) * 2014-03-03 2015-09-03 Quanta Computer Inc. Dockable device and power method thereof
US10199950B1 (en) 2013-07-02 2019-02-05 Vlt, Inc. Power distribution architecture with series-connected bus converter

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JPH0583883A (en) * 1991-09-19 1993-04-02 Mitsubishi Electric Corp Electronic component device
FR2721766B1 (en) * 1994-06-28 1996-07-26 Thomson Consumer Electronics Electronic device with two power modes.

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US3609386A (en) * 1969-06-30 1971-09-28 Ibm Apparatus for providing uninterrupted power to a load
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JPS59156124A (en) * 1983-02-24 1984-09-05 松下電器産業株式会社 Power source backup circuit

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US3293444A (en) * 1962-09-05 1966-12-20 United Aircraft Corp Build-up circuit for series-connected power supplies
US3609386A (en) * 1969-06-30 1971-09-28 Ibm Apparatus for providing uninterrupted power to a load
US3916212A (en) * 1973-02-19 1975-10-28 Philips Corp Emergency lighting system for a tunnel
US3808452A (en) * 1973-06-04 1974-04-30 Gte Automatic Electric Lab Inc Power supply system having redundant d. c. power supplies
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US4272650A (en) * 1976-12-29 1981-06-09 International Mobile Machines Incorporated Power supply system
JPS5638944A (en) * 1979-09-04 1981-04-14 Tokyo Shibaura Electric Co Backup power maintenance system
US4441031A (en) * 1980-12-10 1984-04-03 Tokyo Shibaura Denki Kabushiki Kaisha Power source voltage change discrimination circuit
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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4795914A (en) * 1986-12-26 1989-01-03 Kabushiki Kaisha Toshiba Power supply circuit with backup function
US4760276A (en) * 1987-11-09 1988-07-26 Unisys Corporation Power supply system, for segmented loads, having phantom redundancy
DE3926351A1 (en) * 1988-08-31 1990-03-29 Siemens Ag Power supply installation suitable for important electronic system - has emergency constant voltage source(s) connected via diode(s) and having current limiter(s)
US5300874A (en) * 1989-09-29 1994-04-05 Kabushiki Kaisha Toshiba Intelligent power supply system for a portable computer
US5138142A (en) * 1990-06-19 1992-08-11 Mitsubishi Denki Kabushiki Kaisha Ic card with improved power supply switching circuitry
US5214311A (en) * 1990-07-16 1993-05-25 Fujitsu Limited Power supply device
EP0467778A3 (en) * 1990-07-16 1994-06-15 Fujitsu Ltd A power supply device
EP0467778A2 (en) * 1990-07-16 1992-01-22 Fujitsu Limited A power supply device
US5160851A (en) * 1990-08-28 1992-11-03 Nynex Corporation Rechargeable back-up battery system including a number of battery cells having float voltage exceeding maximum load voltage
US5777454A (en) * 1996-05-29 1998-07-07 Peco Ii, Inc. Back-up battery management system for a DC power supply
US5886503A (en) * 1996-05-29 1999-03-23 Peco Ii, Inc. Back-up battery management apparatus for charging and testing individual battery cells in a string of battery cells
US5892299A (en) * 1996-09-24 1999-04-06 Siewert; James Carl Simultaneous power supply source
US8023290B2 (en) 1997-01-24 2011-09-20 Synqor, Inc. High efficiency power converter
US9143042B2 (en) 1997-01-24 2015-09-22 Synqor, Inc. High efficiency power converter
US8493751B2 (en) 1997-01-24 2013-07-23 Synqor, Inc. High efficiency power converter
US6104103A (en) * 1998-05-08 2000-08-15 Ingalls Shipbuilding, Inc. Simultaneous power supply source
CN1330074C (en) * 2003-04-23 2007-08-01 华为技术有限公司 Method and device for backing up secondary power source
US20050074375A1 (en) * 2003-09-26 2005-04-07 Das - Dunnschicht Anlagen Systeme Gmbh Modular system for the treatment of process exhaust gases containing pollutants
US20110308833A1 (en) * 2011-08-30 2011-12-22 Renewable Power Conversion, Inc. Photovoltaic string sub-combiner
US8723370B2 (en) * 2011-08-30 2014-05-13 Renewable Power Conversion, Inc. Photovoltaic string sub-combiner
US10199950B1 (en) 2013-07-02 2019-02-05 Vlt, Inc. Power distribution architecture with series-connected bus converter
US10594223B1 (en) 2013-07-02 2020-03-17 Vlt, Inc. Power distribution architecture with series-connected bus converter
US11075583B1 (en) 2013-07-02 2021-07-27 Vicor Corporation Power distribution architecture with series-connected bus converter
US11705820B2 (en) 2013-07-02 2023-07-18 Vicor Corporation Power distribution architecture with series-connected bus converter
US20150248150A1 (en) * 2014-03-03 2015-09-03 Quanta Computer Inc. Dockable device and power method thereof
US9804648B2 (en) * 2014-03-03 2017-10-31 Quanta Computer Inc. Dockable device and power method thereof

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Publication number Publication date
KR860002167A (en) 1986-03-26
GB8518465D0 (en) 1985-08-29
GB2162706B (en) 1988-02-03
GB2162706A (en) 1986-02-05
JPS6142235A (en) 1986-02-28

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